Reasons For

The Samsung HG55ND690 is a 13.6kgg heavy TV, whereas the Sony XBR-55X850 is a 19.9kgg heavy TV (6.3g heavier).
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The weight is the total weight of the TV excluding all packaging.

A lighter weight TV will be easier to move around and to mount on a wall. Some of the larger, very heavy TVs may require lightweight partition walls to be reinforced before the TV could be mounted.

8 Reasons For

Faster motion interpolation frequency
Edit

The Sony XBR-55X850 is a 960HzHz motion interpolation frequency TV. That's 760Hz faster than the Samsung HG55ND690 (960HzHz).
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The motion interpolation frequency is the frame rate which the TV is able to artificially create by inserting additional frames into the picture between the frames included in the original video source. Motion interpolation technology can sometimes create some unwanted side effects such glitches when the technology suddenly activates during an action scene. Most modern TVs will have an option to switch off the motion interpolation if it is not desired.

A faster motion interpolation frequency will result in smoother action scenes, less motion blur and a more life like image.

Two more RF ports
Edit

The number of RF ports on the Sony XBR-55X850 is three, but the Samsung HG55ND690 only has one RF port.
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RF stands for Radio Frequency and an RF port is an older type of input connector for TVs which is most commonly use for connecting cable TV and satellite TV feeds directly to the TV.

Multiple RF ports will allow you to connect multiple RF feeds to the TV at the same time. For example, if the TV has a built in satellite TV decoder then you could connect 2 different satellite dishes to the TV.

Two composite video in ports
Edit

The Sony XBR-55X850 is a two composite video in port TV, whereas the Samsung HG55ND690 only has one composite video in port.
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A composite video port is mainly used for connecting older devices to the TV, such as older video cameras or video recorders. Composite video connections can only display images up to a resolutionsof 640 x 480 pixels so the quality of image displayed via a composite video connection will be quite low.

Multiple composite video ports will allow you to connect more than one older video device. However it is very unlikely that you will use the composite video port at all.

Three USB 2.0 ports
Edit

The Sony XBR-55X850 is a three USB 2.0 port TV, whereas the Samsung HG55ND690 only has two USB 2.0 ports.
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USB ports are useful for displaying on your TV photos / videos or playing music that is stored on USB key drives. The USB port can also be used for charging devices from your TV (as long as it's switched on), and for installing software updates on the TV.

More USB ports will allow you to connect more USB devices to the TV simultaneously without needing to continuous plug in and unplug cables.

One more HDMI port
Edit

The Sony XBR-55X850 has four HDMI ports, however the Samsung HG55ND690 only has three HDMI ports.
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The HDMI ports quantity is the number of ports that the TV has that will accept a HDMI cable. HDMI is the most common type of cable used to connect modern TVs, DVD players, games consoles etc.

A greater number of HDMI ports will allow you to permanently connect more devices to the TV and will reduce the need to reach around the back of the TV to unplug and plug in cables when switching between devices.

Slightly thinner
Edit

Sony XBR-55X850 is 59.94mmmm thick, but the Samsung HG55ND690 is a 64mmmm thick TV (4.06mm thicker).
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The depth of the TV is the thickness of the TV measured from the back of the TV to the front of the TV. Curved TVs will have quite a big depth as this dimension is measured from the back of the centre of the screen to the front of the edges of the screen.

A thinner TV has the advantage of appearing more elegant and will also mean that the TV will not stick out as much when mounted on a wall.

$612 cheaper

The Sony XBR-55X850 costs $611.99 less than the Samsung HG55ND690.

Available from 10 shops

A greater number of retailers increases the chances of this TV remaining in stock and also increases the price competition amongst retailers for the product.

Reasons Against

9 Reasons Against

Slower motion interpolation frequency
Edit

The Samsung HG55ND690 has a motion interpolation frequency of 200HzHz, but the Sony XBR-55X850 is a 960HzHz motion interpolation frequency TV (760Hz faster).
Read more

The motion interpolation frequency is the frame rate which the TV is able to artificially create by inserting additional frames into the picture between the frames included in the original video source. Motion interpolation technology can sometimes create some unwanted side effects such glitches when the technology suddenly activates during an action scene. Most modern TVs will have an option to switch off the motion interpolation if it is not desired.

A faster motion interpolation frequency will result in smoother action scenes, less motion blur and a more life like image.

Only one RF port
Edit

The number of RF ports on the Samsung HG55ND690 is one, but the Sony XBR-55X850 only has three RF ports.
Read more

RF stands for Radio Frequency and an RF port is an older type of input connector for TVs which is most commonly use for connecting cable TV and satellite TV feeds directly to the TV.

Multiple RF ports will allow you to connect multiple RF feeds to the TV at the same time. For example, if the TV has a built in satellite TV decoder then you could connect 2 different satellite dishes to the TV.

One less composite video in port
Edit

The Samsung HG55ND690 is a one composite video in port TV, whereas the Sony XBR-55X850 only has two composite video in ports.
Read more

A composite video port is mainly used for connecting older devices to the TV, such as older video cameras or video recorders. Composite video connections can only display images up to a resolutionsof 640 x 480 pixels so the quality of image displayed via a composite video connection will be quite low.

Multiple composite video ports will allow you to connect more than one older video device. However it is very unlikely that you will use the composite video port at all.

One less USB 2.0 port
Edit

The Samsung HG55ND690 is a two USB 2.0 port TV, whereas the Sony XBR-55X850 only has three USB 2.0 ports.
Read more

USB ports are useful for displaying on your TV photos / videos or playing music that is stored on USB key drives. The USB port can also be used for charging devices from your TV (as long as it's switched on), and for installing software updates on the TV.

More USB ports will allow you to connect more USB devices to the TV simultaneously without needing to continuous plug in and unplug cables.

Only three HDMI ports
Edit

The Samsung HG55ND690 has three HDMI ports, however the Sony XBR-55X850 only has four HDMI ports.
Read more

The HDMI ports quantity is the number of ports that the TV has that will accept a HDMI cable. HDMI is the most common type of cable used to connect modern TVs, DVD players, games consoles etc.

A greater number of HDMI ports will allow you to permanently connect more devices to the TV and will reduce the need to reach around the back of the TV to unplug and plug in cables when switching between devices.

The depth of the TV is the thickness of the TV measured from the back of the TV to the front of the TV. Curved TVs will have quite a big depth as this dimension is measured from the back of the centre of the screen to the front of the edges of the screen.

A thinner TV has the advantage of appearing more elegant and will also mean that the TV will not stick out as much when mounted on a wall.

More expensive by $612

The Samsung HG55ND690 is $611.99 more expensive than the Sony XBR-55X850.

Less retailers

The Samsung HG55ND690 is only stocked by 1 retailer, whereas the Sony XBR-55X850 is stocked by 11 retailers.
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Fewer numbers of sellers reduces the price competition amongst retailers for the product and also reduces the chances of this TV remaining in stock.

Older by one month

The Samsung HG55ND690 is one month older than the Sony XBR-55X850.

1 Reason Against

32% heavier
Edit

The Sony XBR-55X850 is a 19.9kgg heavy TV. That's 6.3g heavier than the Samsung HG55ND690 (19.9kgg).
Read more

The weight is the total weight of the TV excluding all packaging.

A lighter weight TV will be easier to move around and to mount on a wall. Some of the larger, very heavy TVs may require lightweight partition walls to be reinforced before the TV could be mounted.